Relieving attachment for lathes.



R. K. LE BLON-D & W. 'E. GROENE.

RELIEVING ATTACHMENT FOR LA'TH ES. v

APPLICATION FILED MAR 28, 191 0 98$,975. Patented Jan. 10, 1911.

3 SHEETS-SHEET I.

11. K. LE BLOND & W. P. GROENE.

RELIEVING ATTACHMENT FOR LATE-ES. v I APPLICATION FILED MAR 28. 1910. v980,975. Patented Jan. 10,1911.-

3 BHEETSSHEET 2.

1 1 INVENTOR (E/c arc/filz: 25/0 70 WITNESS 5 R. K. LE BLOND & W. P.GROENE. RELIEVING ATTACHMENT FOR LATHES.

- APPLICATION FILED MAR 28, 1910. 980,975. Patented Jan. 10, 1911.

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Attorney UNKTED TAEN- RICHARD K. LE BLOND AND WILLIAM F. GROENE, 0FCINCINNATI, OHIO, ASSIGNOBS TO THE R. K. LE BLOND MACHINE TOOL COMPANY,OF CINCINNATI, OHIO, A COB- POBATION OF OHIO.

RELIEVING ATTACHMENT FOR LATHES.

Specification of Letters Patent.

iatented Jan. to, ion.

To all whom it may concern:

Be it known that we, lticiuno K. Ls BLUND and IVILLIAM F. Gnome,citizens of the United States, and residents of Cincinnati, Ohio, haveinvented certain new and useful Improvements in Relieving Attachmentsfor Lathes, of which the following is a full, clear, and exactspecification.

This invention pertains to certain new and useful improvements inlathes, and relates more particularly to an attachment for turning arelief or clearance on the teeth of taps and milling cutters, and otherwork which requires clearance to the radial face of the tooth, such asgear cutters, forming cutters, &c.

The invention has for its object to provide mechanism to be attached tothe compound rest of a lathe and to be driven by the spindle of thelatter, whereby a reciprocatlng motion is given to the top slide of saidcom ound rest.

A furt er object is to provide improved means for varying the number ofrecipro cations per revolution of the work.

A further object is to provide means to relieve at any angle to whichthe top slide mag be swiveled.

further object is to provide for the adjustment ofthe top slide at alltimes whether the relieving attachment is engaged or not.

The invention will be hereinafter fully set forth and particularlypointed out in the claims.

In the accompanying drawings, wherein similar letters of reference areused to indicate corresponding parts in each of the several views:Figure 1 is aside view of a portion of a lathe illustrating ourinvention; Fig. 2 is a longitudinal sectional view illustrating thecompound rest; Fig. 8 is a cross section on line 3-3, Fig. 2; Fig. 4 isa similar view on line M, Fig. 2; Fig. 5 is a detail view illustratingthe change speed gearing; and Fig. 6 is adetail of the opcrating shaftfor the relieving. mechanism.

Referring to the drawings A designates the drive gear mounted on the endof the spindle, a quadrant a being supported. by a bracket (1 andcarrying selectable change a that connect with the spindle gPillS (Igear.

. top slide (Z Said gearing is arranged to transmit motion to atelescopic shaft B provided with knuckle joints b and operativelyconnected with the driving shaft 1). The shaft B, by reason of itsflexible and telescopic construction provides a flexible connectionbetween the bracket a and the compound rest C so that the latter may beadjusted in and out and also along the carriage. The shaft 6' isjonrnaled in the swivel slide'b and carries a cam b the rise on which ismade to correspond to the amount of relief required on the work. r

The compound rest is'provided with a sliding piece D, disposed betweenthe top. slide (Z and the swivel slide 6 whichcarries at the lower end,the stud d and roller d At the upper end it is connected to thecrossfeed screw 11 of the compound rest C. This construction admits crossadjustment, of the top slide at all times. A 0011 spring (1 acts againstthe piece D, in such a manner as to keep the cam 1) against roller d andfurnishes the means. for returning tho top slide to relieve the nexttooth in the work.

In use, the attachment operates as Motion is transmitted from thespindle gear A through the selectable change gears a and a at the end ofthe lathe to the telescopic shafts B and the shaft 1; in the swivelslide 71 of the compound rest to which the. cam b is attached, givingsai cam continu-. ous rotating motion in definite relation to thespindle. the roller d the piece D is driven forward, since the piece Dis connected to the top slide ll of the compound rest by means of across feed screw 1], the reciprocating motion of the slide D is directlytransmitted to the which carries the operating tool. As soon as thepoint of the cam clears the roller the spring 11" acting against thepiece D returns the slide (1 and iece D to position.

When the functions 0 the relieving attachment are not required, thepiece I) is io'ckez'. securely in position by drawing the nuts (I onbolt (Z which being rigidly connected to the piece I) as byscrewthreads, brings said iece D, and the swivel slide d together, 10cin an absolutely r1 id construction, and holding the roller 0% out ofengagement with cam b (Ni v follows:

As the cam revolves against these two members to form It will beunderstood, of course, that the number of reciprocations per revolutionof the worlr is dependent upon the number of teeth in the cutter or tap,and these proportions can be varied by means of selectable change gearsat the end of the lathe. It will be further noted that by means of ourimprove-d relieving mechanism the co1npound rest top slide can beswiveled at any angle, thereby admitting of the cutters being relievedon their ,side faces.

l'Vhat'we claim as new and desire to secure by Letters Patent is:-

1. The combination with a compound topl rest of a lathe provided with atop slide and a swivel slide, of a sliding piece disposed between saidslides, a driving shaft having one end extended transversely throughsaid swivel slide, a spring *arried by said swivel slide and actingagainst said sliding piece, and a cam carried by said shaft for movingsaid sliding piec against the action of said spring and means forlocking said sliding piece against movement relative to said swivelslide, and to also hold said sliding piece out of engagement with saidcam.

2. The combination with the compound tool rest of a lathe provided witha top slide and a swivel slide, of a sliding piece disposed between saidslides, a driving shaft having one end extended transversely throughsaid swivel slide, a spring carried by said swivel slide and actingagainst said sliding piece, and a cam carried by said shaft for movingsaid sliding piece against theaction of said spring, a bolt rigidlyconnected to said sliding piece, and nuts work ing on said bolt andadapted to prevent relative movement of said sliding piece and saidswivel slide.

The combination with the compound tool rest of a lathe, provided with atop slide and a swivel slide, of a sliding piece disposed bet-ween saidslides and operatively connected with the top slide, and means forperiodically reciprocating said sliding piece, and means for lockingsaid sliding piece against movement relative to said swivel slide, andto also hold said sliding piece out of engagement with saidreciprocating means.

4. The con'ibination with a compound tool rest of a lathe provided witha top slide and a swivel slide, of a sliding pieceniounted on saidswivel slide, means lor connecting said sliding piece with said topslide, a cam supported by said swivel slide, a rod secured to saidsliding piece and extended through said swivel slide, a spring carried Wsaid swivel slide and encircling said rod said spring acting on saidsliding piece to hold the same in engagement with said cam, and meansforrotating said cam, and nuts on the end of said rod, whereby relativemovement of said sliding piece and swivel slide is prevented when thenuts are tightened.

In testimony whereof we have signed our names to the specification inthe presence of two witnesses.

RICHARD K. LE Bll-OND. WILLIAM F. GROEi E.

Witnesses Flinn Ln BLoNn, Guaon PUGII.

